If you like the idea of rice (it symbolizes prosperity) but don't want to leave a post-wedding mess or choke the birds, how 'bout using heart-shaped faux rice, which will dissolve the next time it rains.

"Wedding bells" used to be rung to ward off evil spirits. Even if you're not superstitious, a hundred or so jingling bells—tie each to a ribbon that matches your color palette—will sound sooooo pretty!